Tes$ng and Debugging

Would be great if our code always worked properly the rst $me we run it!

But life aint perfect, so we need: Tes$ng methods Ways of trying code on examples to determine if running correctly

Debugging methods Ways of xing a program that you know does not work as intended

When should you test and debug?

Design your code for ease of tes$ng and debugging Break program into components that can be tested and debugged independently

Document constraints on modules Expecta$ons on inputs, on outputs Even if code does not enforce constraints, valuable for debugging to have descrip$on

Document assump$ons behind code design

When are you ready to test?

Ensure that code will actually run Remove syntax errors Remove sta$c seman$c errors Both of these are typically handled by Python interpreter

Have a set of expected results (i.e. input-output pairings) ready